Filled abrasive article and filler for the same



Patented Nov. 2, 1943 FILLED ABRASIVE ARTICLE AND FILLER FOR THE SAME Luther P. Jackson, Detroit, Mich.

No Drawing. Application February 22, 1943, Serial No. 476,763

8 Claims. (01. 51-295) Th invention relates to abrasive articles such as grinding wheels, hones and the like and of that type in which the voids between abrasive particles are filled with a different material. Heretofore, articles of this general type have been manufactured using as the filler sulphur and various other materials which impart desirable characteristics to the article. I have discovered that further improved characteristics may be obtained by the use of a different flller which irritself and in combination with the abrasive article forms the subject matter of the present invention.

My improved filler is formed essentially of a mixture of sulphur and chlorinated diphenyl. These ingredients are preferably substantially in the ratio of two-hundred parts sulphur to twentyfour parts chlorinated diphenyl but such exact proportion is not absolutely necessary and may be varied. In preparing the compound the sulphur is melted and raised to a temperature of 300 F. The chlorinated diphenyl in crystals is then introduced into the melted sulphur and will become thoroughly commingled therewith.

The filler thus prepared and while in a heated and highly fluid state is applied to the abrasive article such, for instance, as a synthetic abrasive stone by the usual method of impregnation. The fluid. penetrates and fills the pores or voids displacing the air therefrom and after cooling forms a solid binder of high tensile strength.

One valuable characteristic of the compound is that in the liquid state it has a 'much lower viscosity than melted sulphur and, therefore, will more thoroughly penetrate the structure and fill the voids thereof. A further advantageous property is that the fluid has a high wetting characteristic so as to more uniformly cover and adhere to the surface of the P ticles. It has been found that with an abrasive article so treated there is approximately twenty per cent more of the filler remaining in the pores than where pure sulphur is used. Also there is a higher tensile strength and a definite increase in the life of the stone. A further feature of value is that the article has a much wider range of work ing temperature as, for instance, between 225 F. to 320 F. The flash or flame point is also higher with this mixture than with sulphur alone.

A further improvement is obtained by adding to the molten mixture in the proportions above described a small amount of selenium as, for instance, six parts. This will result in a still higher tensile strength in the binder while retaining all of the other valuable characteristics previously described.

What I claim as my invention is:

1. An abrasive article impregnated with a filler comprising sulphur and chlorinated diphenyl.

2. An abrasive article impregnated with a filler comprising sulphur, chlorinated diphenyl and selenium.

3. An abrasive article impregnated with a filler comprising sulphur and chlorinated diphenyl substantially in the proportion of nine parts sulphur to one part chlorinated diphenyl.

4. An abrasive article impregnated with a flller comprising sulphur, chlorinated diphenyl and selenium substantially in the proportion of fifty parts sulphur, six parts chlorinated diphenyl and 1.5 parts selenium.

5. A flller comprising sulphur and chlorinated diphenyl.

6. A filler comprising sulphur, chlorinated diphenyl and selenium.

7. A filler comprising sulphur and chlorinated diphenylsubstantialiy in the proportion of nine parts sulphur to one part chlorinated diphenyl.

8. A flller comprising sulphur, chlorinated diphenyl and selenium substantially in the proportion of fifty parts sulphur. six parts chlorinated diphenyl and 1.5 parts selenium.

LUTHER P. JACKSON. 

